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Yorick Barbanneau 2021-10-11 22:27:00 +02:00
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code/machine/sysdep.h Normal file
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// sysdep.h
// System-dependent interface. Nachos uses the routines defined
// here, rather than directly calling the UNIX library functions, to
// simplify porting between versions of UNIX, and even to
// other systems, such as MSDOS and the Macintosh.
//
// Copyright (c) 1992-1993 The Regents of the University of California.
// All rights reserved. See copyright.h for copyright notice and limitation
// of liability and disclaimer of warranty provisions.
#ifndef SYSDEP_H
#define SYSDEP_H
#include "copyright.h"
// Check file to see if there are any characters to be read.
// If no characters in the file, return without waiting.
extern bool PollFile(int fd);
// File operations: open/read/write/lseek/close, and check for error
// For simulating the disk and the console devices.
extern int OpenForWrite(const char *name);
extern int OpenForReadWrite(const char *name, bool crashOnError);
extern void Read(int fd, void *buffer, int nBytes);
extern int ReadPartial(int fd, void *buffer, int nBytes);
extern void WriteFile(int fd, const void *buffer, int nBytes);
extern void Lseek(int fd, int offset, int whence);
extern int Tell(int fd);
extern void Close(int fd);
extern bool Unlink(const char *name);
// Interprocess communication operations, for simulating the network
extern int OpenSocket();
extern void CloseSocket(int sockID);
extern void AssignNameToSocket(const char *socketName, int sockID);
extern void DeAssignNameToSocket(const char *socketName);
extern bool PollSocket(int sockID);
extern void ReadFromSocket(int sockID, void *buffer, int packetSize);
extern void SendToSocket(int sockID, const void *buffer, int packetSize,const char *toName);
// Process control: abort, exit, and sleep
extern void Abort();
extern void Exit(int exitCode);
extern void Delay(int seconds);
// Initialize system so that cleanUp routine is called when user hits ctl-C
extern void CallOnUserAbort(VoidNoArgFunctionPtr cleanUp);
extern void BlockUserAbort(void);
extern void UnBlockUserAbort(void);
// Initialize the pseudo random number generator
extern void RandomInit(unsigned seed);
extern int Random();
// Allocate, de-allocate an array, such that de-referencing
// just beyond either end of the array will cause an error
extern char *AllocBoundedArray(int size);
extern void DeallocBoundedArray(char *p, int size);
// Other C library routines that are used by Nachos.
// These are assumed to be portable, so we don't include a wrapper.
extern "C" {
#include <stdlib.h> // for atoi, atof, abs
#include <stdio.h> // for printf, fprintf
#include <string.h> // for DEBUG, etc.
}
#endif // SYSDEP_H